matakuliah: s2094 / rekayasa pondasi tahun: 2005 versi: 1.1 pertemuan 09 penurunan pondasi dangkal
TRANSCRIPT
Matakuliah : S2094 / Rekayasa Pondasi
Tahun : 2005
Versi : 1.1
Pertemuan 09Penurunan Pondasi Dangkal
Shallow Foundations - Settlement
1. Design Requirements2. Overview of Settlement Analysis Methods3. Induced Stresses Beneath Shallow Foundations4. Settlement Analysis Based on Laboratory Tests5. Settlement Spreadsheet 6. Settlement in Analysis Based on In-situ Tests7. Settlement in Stratified Soils8. Differential Settlement9. Rate of Settlement10. Accuracy of Settlement Predictions
Design Requirements
Total Settlement ()
Differential Settlement(D)
a
DaD
versus D
(a)Leaning Tower, Pisa
(b) Palacio de las Bellas Artes, Mexico City
Overview; Settlement Analysis
Plate Load Tests Based on Laboratory Test Data Based on In-situ Tests
Plate Load Tests
Methods for Calculating Induced Stresses
Boussinesq’s Method Westergaard’s Method Simplified Method 60o Approximation ( CE 3321 textbook)
)( zDz qI
Boussinesq’s Method
Boussinesq’s Method
Boussinesq’s Method
Pressure BulbsNewmark’s Solution of Boussinesq Method
Chart Solutions (Stress Bulbs)
Chart Solutions
(Stress Bulbs)
Westergaard’s Method
Provided solution for layered soils
Point Loads
Westergaard’s Method
• For distributed loads
Simplified Methods (Approximate)
• For circular foundations (Poulos and Davis, 1974)
)(
21
11
50.1
2 zD
f
z q
zB
Simplified Methods (Approximate)
• For square foundations (Poulos and Davis, 1974)
)(
21
11
76.1
2 zD
f
z q
zB
Simplified Methods (Approximate)
• For continuous foundations (Poulos and Davis, 1974)
)(
21
11
60.2
2 zD
f
z q
zB
Simplified Methods (Approximate)• For rectangular foundations (Poulos and
Davis, 1974)
)(
21
11
/84.060.2
/62.038.1 zD
LB
LB
f
z q
zB
Approximate Methods
1:2 method (60° approximation)
Computer Software FTGSETT (settlement.xls)